CN110716111A - Ultrahigh-voltage XLPE cable insulation online monitoring device and method based on vector method - Google Patents

Ultrahigh-voltage XLPE cable insulation online monitoring device and method based on vector method Download PDF

Info

Publication number
CN110716111A
CN110716111A CN201911106471.XA CN201911106471A CN110716111A CN 110716111 A CN110716111 A CN 110716111A CN 201911106471 A CN201911106471 A CN 201911106471A CN 110716111 A CN110716111 A CN 110716111A
Authority
CN
China
Prior art keywords
phase
fpga
voltage
load
resistor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201911106471.XA
Other languages
Chinese (zh)
Other versions
CN110716111B (en
Inventor
王婷婷
宫洵
肖微
曾向君
贾磊
张福增
郑欢
李忠华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Harbin University of Science and Technology
Power Grid Technology Research Center of China Southern Power Grid Co Ltd
Original Assignee
Harbin University of Science and Technology
Power Grid Technology Research Center of China Southern Power Grid Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Harbin University of Science and Technology, Power Grid Technology Research Center of China Southern Power Grid Co Ltd filed Critical Harbin University of Science and Technology
Priority to CN201911106471.XA priority Critical patent/CN110716111B/en
Publication of CN110716111A publication Critical patent/CN110716111A/en
Application granted granted Critical
Publication of CN110716111B publication Critical patent/CN110716111B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

一种基于向量法的超高压XLPE电缆绝缘在线监测装置及监测方法属于电缆在线监测技术领域；现有技术难以区分零序电流和电缆绝缘的泄露电流；本装置包括三相电源的输出端分别通过各相XLPE电缆与各相负载的输入端连接，各相负载与地GND连接，在每相XLPE电缆的首端和末端均连接有对应的首端穿心差分式CT和末端穿心式CT；每相末端穿心式CT均通过一个电阻与FPGA连接，FPGA通过每相的电压控制电流源与每相的首端穿心差分式CT连接；每相首端穿心差分式CT与一个电阻连接，三相首端穿心差分式CT串联与FPGA连接，FPGA与计算机双向连接；实现三相泄露电流的测量；本方法通过对比分析三相泄露电流与参考相泄露电流的向量关系，实现了XLPE电力电缆绝缘状态的准确评价。

Figure 201911106471

An on-line monitoring device and monitoring method for ultra-high voltage XLPE cable insulation based on vector method belong to the technical field of on-line monitoring of cables; the prior art is difficult to distinguish between zero-sequence current and leakage current of cable insulation; Each phase XLPE cable is connected to the input end of each phase load, each phase load is connected to the ground GND, and the head end and the end of each phase XLPE cable are connected with the corresponding head-end through-center differential CT and end through-center CT; The feedthrough CT at the end of each phase is connected to the FPGA through a resistor, and the FPGA is connected to the feedthrough differential CT at the head end of each phase through the voltage-controlled current source of each phase; the feedthrough differential CT at the head end of each phase is connected with a resistor , the three-phase head-end through-center differential CT is connected in series with the FPGA, and the FPGA and the computer are connected in both directions; the measurement of the three-phase leakage current is realized; this method realizes the XLPE by comparing and analyzing the vector relationship between the three-phase leakage current and the reference phase leakage current. Accurate evaluation of the insulation state of power cables.

Figure 201911106471

Description

一种基于向量法的超高压XLPE电缆绝缘在线监测装置及监测 方法An online monitoring device and monitoring of ultra-high voltage XLPE cable insulation based on vector method method

技术领域technical field

本发明属于电缆在线监测技术领域，尤其涉及一种基于向量法的超高压XLPE电缆绝缘在线监测装置及监测方法。The invention belongs to the technical field of on-line monitoring of cables, and in particular relates to an on-line monitoring device and monitoring method for ultra-high voltage XLPE cable insulation based on a vector method.

背景技术Background technique

交联聚乙烯(XLPE)绝缘电力电缆由于其优异的性能已成为城市电网的主体，最高电压等级达到500kV级，电力电缆的绝缘状态直接影响城市电网的运行安全。为了确保供电系统以及电力电缆的安全运行，探索有效的超高压XLPE电力电缆绝缘在线监测新技术已成为电力运行部门十分关注的课题。Cross-linked polyethylene (XLPE) insulated power cables have become the main body of urban power grids due to their excellent performance. The highest voltage level reaches 500kV. The insulation state of power cables directly affects the operation safety of urban power grids. In order to ensure the safe operation of the power supply system and power cables, it has become a topic of great concern for the power operation department to explore an effective new technology for online monitoring of ultra-high voltage XLPE power cable insulation.

长期以来高压及超高压电缆的绝缘状态一直沿用传统的定期试验方法(即预防性试验)来检测，预防性试验难以发现电缆的潜在故障，不能提前做出相应的判断和采取可行措施来预防突发线路故障。此外，定期的电网停电试验将造成经济损失和影响人民群众的日常生活。因此，对高压电力电缆进行绝缘故障诊断与在线监测技术的研究以及研发出可靠的在线监测设备显得尤其重要。For a long time, the insulation state of high-voltage and ultra-high-voltage cables has been detected by the traditional periodic test method (ie preventive test). Line failure. In addition, regular grid outage tests will cause economic losses and affect people's daily life. Therefore, the research on insulation fault diagnosis and on-line monitoring technology of high-voltage power cables and the development of reliable on-line monitoring equipment are particularly important.

国内外研究者对XLPE电缆绝缘检测技术做了大量研究，取得了很多有价值的成果，目前XLPE电缆绝缘检测方法主要有：直流分量法、直流叠加法、交流叠加法、局部放电法、谐波分量法、介质损耗角正切法和接地电流法等。其中接地电流法是通过测量XLPE电缆绝缘的接地电流判别电缆绝缘的绝缘状态，但是该方法受到电缆接地方式、交叉互联和负载电流的影响，即当负载电流不对称导致零序电流不为零，将难以区分零序电流和电缆绝缘的泄露电流。Domestic and foreign researchers have done a lot of research on XLPE cable insulation detection technology, and have achieved many valuable results. At present, XLPE cable insulation detection methods mainly include: DC component method, DC superposition method, AC superposition method, partial discharge method, harmonic wave Component method, dielectric loss tangent method and ground current method, etc. The grounding current method is to determine the insulation state of the cable insulation by measuring the grounding current of the XLPE cable insulation, but this method is affected by the cable grounding method, cross-connection and load current, that is, when the load current is asymmetrical, the zero-sequence current is not zero. It will be difficult to distinguish between the zero sequence current and the leakage current of the cable insulation.

发明内容SUMMARY OF THE INVENTION

本发明克服了上述现有技术的不足，提供一种基于向量法的超高压XLPE电缆绝缘在线监测装置及监测方法，本装置三相采用首端穿心差分式电流互感器从超高压XLPE电缆线芯处获取XLPE电力电缆绝缘的三相泄露电流，解决了超高压XLPE电缆绝缘在线监测技术中泄露电流提取面临的难题；本方法通过对比分析三相泄露电流与参考相泄露电流的向量关系，建立三相泄露电流随时间的变化关系，实现了XLPE电力电缆绝缘状态的准确评价。The present invention overcomes the above-mentioned deficiencies of the prior art, and provides an on-line monitoring device and monitoring method for ultra-high voltage XLPE cable insulation based on a vector method. The three-phase leakage current of XLPE power cable insulation is obtained at the core, which solves the problem of leakage current extraction in the on-line monitoring technology of ultra-high voltage XLPE cable insulation. In this method, the vector relationship between the three-phase leakage current and the reference phase leakage current is compared and analyzed to establish The relationship between the three-phase leakage current changes with time, and the accurate evaluation of the insulation state of the XLPE power cable is realized.

本发明的技术方案：Technical scheme of the present invention:

技术方案一Technical solution one

一种基于向量法的超高压XLPE电缆绝缘在线监测装置，包括三相电源、A相XLPE电缆、A相首端穿心差分式CT、A相末端穿心式CT、A相负载、B相XLPE电缆、B相首端穿心差分式CT、B相末端穿心式CT、B相负载、C相XLPE电缆、C相首端穿心差分式CT、C相末端穿心式CT、C相负载、FPGA和计算机；所述三相电源的输出端分别通过各相XLPE电缆与各相负载的输入端连接，各相负载与地GND连接，所述在每相XLPE电缆的首端和末端均连接有对应的首端穿心差分式CT和末端穿心式CT；An on-line monitoring device for ultra-high voltage XLPE cable insulation based on vector method, including three-phase power supply, A-phase XLPE cable, A-phase head-end feedthrough differential CT, A-phase end feed-through CT, A-phase load, B-phase XLPE Cable, B-phase head-through differential CT, B-phase end feed-through CT, B-phase load, C-phase XLPE cable, C-phase head-end feed-through differential CT, C-phase end feed-through CT, C-phase load , FPGA and computer; the output end of the three-phase power supply is connected to the input end of each phase load through each phase XLPE cable, and each phase load is connected to the ground GND, and the head end and the end of each phase XLPE cable are connected. There are corresponding head-to-end transcardiac differential CT and end-to-end transcardial CT;

所述A相末端穿心式CT的测量绕组输出端通过电阻RA与FPGA的输入端连接，所述FPGA的输出端通过A相电压控制电流源与A相首端穿心差分式CT的电流补偿绕组输入端连接，所述A相首端穿心差分式CT的测量绕组输出端与电阻R1连接；The measurement winding output end of the feedthrough CT at the end of the A phase is connected to the input end of the FPGA through the resistor RA, and the output end of the FPGA controls the current source and the current compensation of the feedthrough differential CT at the head end of the A phase through the phase A voltage. The winding input end is connected, and the measurement winding output end of the A-phase head-end through-center differential CT is connected with the resistor R1;

所述B相末端穿心式CT的测量绕组输出端通过电阻RB与FPGA的输入端连接，所述FPGA的输出端通过B相电压控制电流源与B相首端穿心差分式CT的电流补偿绕组输入端连接，所述B相首端穿心差分式CT的测量绕组输出端与电阻R2连接；The measurement winding output end of the feedthrough CT at the end of the B phase is connected to the input end of the FPGA through the resistor RB, and the output end of the FPGA controls the current source and the current compensation of the feedthrough differential CT at the head end of the B phase through the B phase voltage. The winding input end is connected, and the measurement winding output end of the B-phase head-end through-center differential CT is connected with the resistor R2;

所述C相末端穿心式CT的测量绕组输出端通过电阻RC与FPGA的输入端连接，所述FPGA的输出端通过C相电压控制电流源与C相首端穿心差分式CT的电流补偿绕组输入端连接，所述C相首端穿心差分式CT的测量绕组输出端与电阻R3连接；所述电阻R1通过一条电线串联电阻R2和电阻R3后连接到A/D转换器，电阻R1与A/D转换器连接，所述A/D转换器与FPGA的输入端连接，所述FPGA与电阻R3通过A/D转换器连接，所述FPGA与计算机双向连接。The measuring winding output end of the C-phase end feedthrough CT is connected to the input end of the FPGA through the resistor RC, and the output end of the FPGA controls the current source and the C-phase head end feedthrough differential CT current compensation through the C-phase voltage. The winding input end is connected, and the measurement winding output end of the C-phase head-end through-center differential CT is connected to the resistor R3; the resistor R1 is connected to the A/D converter through a wire in series with the resistor R2 and the resistor R3, and the resistor R1 It is connected with the A/D converter, the A/D converter is connected with the input end of the FPGA, the FPGA is connected with the resistor R3 through the A/D converter, and the FPGA is connected with the computer bidirectionally.

进一步地，所述FPGA与电阻RA、电阻RB及电阻RC均通过A/D转换器连接。Further, the FPGA is connected to the resistor RA, the resistor RB and the resistor RC through an A/D converter.

进一步地，所述FPGA与A相电压控制电流源、B相电压控制电流源及C相电压控制电流源均通过D/A转换器连接。Further, the FPGA is connected to the A-phase voltage-controlled current source, the B-phase voltage-controlled current source, and the C-phase voltage-controlled current source through a D/A converter.

技术方案二Technical solution two

一种基于技术方案一所述一种基于向量法的超高压XLPE电缆绝缘在线监测装置实现的监测方法，包括以下步骤：A monitoring method based on the implementation of a vector method-based ultra-high voltage XLPE cable insulation online monitoring device described in technical solution 1, comprising the following steps:

步骤a、三相电源接通电源，电能分别通过各相的XLPE电缆传输到各相负载；Step a, the three-phase power supply is connected to the power supply, and the electric energy is transmitted to the load of each phase through the XLPE cable of each phase;

步骤b、通过C相首端穿心差分式CT的测量绕组检测C相XLPE电缆线芯处的参考相泄露电流信息，经过电阻R3将参考相泄露电流信息转换为参考相泄露电压信息，通过A/D转换器将参考相泄露电压信息转换为数字参考相泄露电压信息传输到FPGA中，通过计算机显示，用于实现参考相泄露电流的测量；Step b. Detect the reference phase leakage current information at the core of the C-phase XLPE cable through the measuring winding of the C-phase head end through-center differential CT, convert the reference phase leakage current information into the reference phase leakage voltage information through the resistor R3, and pass A The /D converter converts the reference phase leakage voltage information into digital reference phase leakage voltage information and transmits it to the FPGA, and displays it through the computer to realize the measurement of the reference phase leakage current;

步骤c、通过各相首端穿心差分式CT的测量绕组检测三相XLPE电缆线芯处的三相泄露电流信息，经过电阻R1、电阻R2和电阻R3将三相泄露电流信息转换为三相泄露电压信息，通过A/D转换器将三相泄露电压信息转换为数字三相泄露电压信息传输到FPGA中，通过计算机显示，以三相泄露电流信息与参考相泄露电流信息对比作为评价参数，实现XLPE电力电缆绝缘状态的评价，能够判断出具体那一相XLPE电缆出现故障和故障相的绝缘状态；Step c. Detect the three-phase leakage current information at the core of the three-phase XLPE cable through the measuring winding of the through-center differential CT at the head end of each phase, and convert the three-phase leakage current information into three-phase through the resistance R1, the resistance R2 and the resistance R3. Leakage voltage information, convert the three-phase leakage voltage information into digital three-phase leakage voltage information through the A/D converter and transmit it to the FPGA, display it through the computer, and compare the three-phase leakage current information with the reference phase leakage current information as the evaluation parameter, Realize the evaluation of the insulation state of XLPE power cables, and can determine the specific phase of the XLPE cable that is faulty and the insulation state of the faulty phase;

步骤d、通过各相的末端穿心式CT的测量绕组检测负载电流信息，通过每相末端穿心式CT的测量绕组输出端的电阻将负载电流信息转换为负载电压信号，并将所述负载电压信号传输到FPGA中，通过计算机进行显示，用于实现负载电流的测量；In step d, the load current information is detected through the measurement winding of the feedthrough CT at the end of each phase, and the load current information is converted into a load voltage signal through the resistance of the output end of the measurement winding of the feedthrough CT at the end of each phase, and the load voltage is converted into the load voltage signal. The signal is transmitted to the FPGA and displayed by the computer to measure the load current;

步骤e、FPGA根据将实时接收的所述负载电压信号传输到各相的电压控制电源中，各相的电压控制电源将电压信号转换为电流信号，传输到各相首端穿心差分式CT的电流补偿绕组中，经过各相首端穿心差分式CT的电流补偿绕组磁路补偿消除负载电流信号，通过各相首端穿心差分式CT的测量绕组测量到各相XLPE电缆绝缘本体的实际泄露电流信息，经过电阻R1、电阻R2和电阻R3将实际三相泄露电流信息转换为实际三相泄露电压信号，经过A/D转换器将实际三相泄露电压信息转换为数字实际三相泄露电压信号，将所述数字实际三相泄露电压信号传输到FPGA中，通过计算机进行显示，用于实现实际三相泄露电流的测量。In step e, the FPGA transmits the load voltage signal received in real time to the voltage control power supply of each phase, and the voltage control power supply of each phase converts the voltage signal into a current signal, and transmits it to the head end of each phase through the center differential CT. In the current compensation winding, the load current signal is eliminated by the magnetic circuit compensation of the current compensation winding of the through-center differential CT at the head end of each phase. Leakage current information, the actual three-phase leakage current information is converted into the actual three-phase leakage voltage signal through the resistor R1, the resistor R2 and the resistor R3, and the actual three-phase leakage voltage information is converted into the digital actual three-phase leakage voltage through the A/D converter The digital actual three-phase leakage voltage signal is transmitted to the FPGA, and displayed by the computer, so as to realize the measurement of the actual three-phase leakage current.

进一步地，步骤d中所述各相末端穿心式CT的测量绕组输出端连接的电阻将负载电流信息转换为电压信号后，均通过A/D转换器将模拟电压信号转换为数字电压信号再传输给FPGA。Further, in step d, after the load current information is converted into a voltage signal by the resistance connected to the output end of the measurement winding of the feedthrough CT at each phase end, the analog voltage signal is converted into a digital voltage signal through an A/D converter, and then the load current information is converted into a voltage signal. transmitted to the FPGA.

进一步地，步骤e中所述FPGA将实时接收到的负载电压信号通过D/A转换器，将数字负载电压信号转换成模拟负载电压信号再传输到各相电压控制电流源中。Further, in step e, the FPGA converts the load voltage signal received in real time through a D/A converter, converts the digital load voltage signal into an analog load voltage signal, and transmits it to each phase voltage control current source.

本发明相对于现有技术具有以下有益效果：The present invention has the following beneficial effects with respect to the prior art:

本发明提供了一种基于向量法的超高压XLPE电缆绝缘在线监测装置及监测方法，本装置三相采用首端穿心差分式电流互感器从超高压XLPE电缆线芯处获取XLPE电力电缆绝缘的三相泄露电流，以三相泄露电流与参考相泄露电流向量对比作为评价参数，实现XLPE电力电缆绝缘状态的评价，首端穿心差动式CT不会影响线路的安全运行，同时克服了电缆交叉互联、绝缘护套破损接地、感应电压和负载电流不对称等因素的影响，解决了超高压XLPE电缆绝缘在线监测技术中泄露电流提取面临的难题。The invention provides an on-line monitoring device and monitoring method for ultra-high voltage XLPE cable insulation based on a vector method. Three-phase leakage current, the comparison of the three-phase leakage current and the reference phase leakage current vector is used as the evaluation parameter to realize the evaluation of the insulation state of the XLPE power cable. The influence of factors such as cross-connection, damaged insulation sheath, grounding, induced voltage and load current asymmetry solves the problem of leakage current extraction in the ultra-high voltage XLPE cable insulation online monitoring technology.

本方法通过对比分析三相泄露电流与参考相泄露电流的向量关系，建立三相泄露电流随时间的变化关系，能够反映绝缘状态随时间的变化关系，同时也能够监测超高压XLPE电缆的载流量信息，判定故障相的绝缘状态，避免了负载电流的影响，所得信息将真实反映超高压XLPE电缆的绝缘状态；实现了XLPE电力电缆绝缘状态的准确评价。By comparing and analyzing the vector relationship between the three-phase leakage current and the reference phase leakage current, this method establishes the variation relationship of the three-phase leakage current with time, which can reflect the variation relationship of the insulation state with time, and can also monitor the current carrying capacity of the ultra-high voltage XLPE cable. information, determine the insulation state of the faulty phase, avoid the influence of the load current, and the obtained information will truly reflect the insulation state of the ultra-high voltage XLPE cable; it realizes the accurate evaluation of the insulation state of the XLPE power cable.

本方法通过本装置实现三相泄露电流的测量，采用穿心差分式CT从电缆线芯处获取的一种测试方法，消除了超高压电缆交叉互联、负载电流和接地方式等因素的影响，实现了超高压XLPE电缆的绝缘状态的准确评价；The method realizes the measurement of the three-phase leakage current through the device, adopts a test method obtained from the cable core by the through-core differential CT, and eliminates the influence of factors such as the cross-connection of the ultra-high voltage cable, the load current and the grounding method, and realizes the Accurate evaluation of the insulation state of EHV XLPE cables;

附图说明Description of drawings

图1是本发明结构原理图；Fig. 1 is the structural principle diagram of the present invention;

图2是三相泄露电流向量图。Figure 2 is a three-phase leakage current vector diagram.

具体实施方式Detailed ways

以下将结合附图对本发明进行详细说明。The present invention will be described in detail below with reference to the accompanying drawings.

具体实施方式一Specific implementation one

一种基于向量法的超高压XLPE电缆绝缘在线监测装置，如图1所示，包括三相电源、A相XLPE电缆、A相首端穿心差分式CT、A相末端穿心式CT、A相负载、B相XLPE电缆、B相首端穿心差分式CT、B相末端穿心式CT、B相负载、C相XLPE电缆、C相首端穿心差分式CT、C相末端穿心式CT、C相负载、FPGA和计算机；An EHV XLPE cable insulation online monitoring device based on the vector method, as shown in Figure 1, includes three-phase power supply, A-phase XLPE cable, A-phase head-end through-center differential CT, A-phase end through-center CT, A Phase load, B-phase XLPE cable, B-phase head-through differential CT, B-phase end feed-through CT, B-phase load, C-phase XLPE cable, C-phase head-through differential CT, C-phase end feed-through type CT, C-phase load, FPGA and computer;

所述三相电源的输出端通过A相XLPE电缆与A相负载的输入端连接，所述A相负载与地GND连接；所述A相XLPE电缆的首端和末端分别连接有A相首端穿心差分式CT和A相末端穿心式CT，所述A相末端穿心式CT的测量绕组输出端通过电阻RA与FPGA的输入端连接，所述FPGA的输出端通过A相电压控制电流源与A相首端穿心差分式CT的电流补偿绕组输入端连接，所述A相首端穿心差分式CT的测量绕组输出端与电阻R1连接；The output end of the three-phase power supply is connected to the input end of the A-phase load through the A-phase XLPE cable, and the A-phase load is connected to the ground GND; the head end and the end of the A-phase XLPE cable are respectively connected with the A-phase head end Feedthrough differential CT and A-phase end feedthrough CT, the measurement winding output of the A-phase end feedthrough CT is connected to the input end of the FPGA through the resistor RA, and the output end of the FPGA controls the current through the A-phase voltage The source is connected to the input end of the current compensation winding of the first-end feed-through differential CT of the A phase, and the measurement winding output end of the first-end feed-through differential CT of the A phase is connected to the resistor R1;

所述三相电源的输出端通过B相XLPE电缆与B相负载的输入端连接，所述B相负载与地GND连接；所述B相XLPE电缆的首端和末端分别连接有B相首端穿心差分式CT和B相末端穿心式CT，所述B相末端穿心式CT的测量绕组输出端通过电阻RB与FPGA的输入端连接，所述FPGA的输出端通过B相电压控制电流源与B相首端穿心差分式CT的电流补偿绕组输入端连接，所述B相首端穿心差分式CT的测量绕组输出端与电阻R2连接；The output end of the three-phase power supply is connected to the input end of the B-phase load through the B-phase XLPE cable, and the B-phase load is connected to the ground GND; the head end and the end of the B-phase XLPE cable are respectively connected with the B-phase head end Feedthrough differential CT and B-phase end feedthrough CT, the measurement winding output of the B-phase end feedthrough CT is connected to the input end of the FPGA through the resistor RB, and the output end of the FPGA controls the current through the B-phase voltage The source is connected to the input end of the current compensation winding of the first-end feed-through differential CT of phase B, and the measurement winding output end of the first-end feed-through differential CT of the B phase is connected to the resistor R2;

所述三相电源的输出端通过C相XLPE电缆与C相负载的输入端连接，所述C相负载与地GND连接；所述C相XLPE电缆的首端和末端分别连接有C相首端穿心差分式CT和C相末端穿心式CT，所述C相末端穿心式CT的测量绕组输出端通过电阻RC与FPGA的输入端连接，所述FPGA的输出端通过C相电压控制电流源与C相首端穿心差分式CT的电流补偿绕组输入端连接，所述C相首端穿心差分式CT的测量绕组输出端与电阻R3连接；The output end of the three-phase power supply is connected to the input end of the C-phase load through the C-phase XLPE cable, and the C-phase load is connected to the ground GND; the head end and the end of the C-phase XLPE cable are respectively connected with the C-phase head end Feedthrough differential CT and C-phase end feedthrough CT, the measurement winding output of the C-phase end feedthrough CT is connected to the input end of the FPGA through the resistor RC, and the output end of the FPGA controls the current through the C-phase voltage The source is connected to the current compensation winding input end of the C-phase head-end feed-through differential CT, and the measurement winding output end of the C-phase head-end feed-through differential CT is connected to the resistor R3;

所述电阻R1通过一条电线串联电阻R2和电阻R3后连接到A/D转换器，电阻R1与A/D转换器连接，所述A/D转换器与FPGA的输入端连接，所述FPGA与电阻R1、电阻R2和电阻R3通过A/D转换器连接，所述FPGA与计算机双向连接。The resistor R1 is connected to the A/D converter through a wire in series with the resistor R2 and the resistor R3, the resistor R1 is connected to the A/D converter, the A/D converter is connected to the input end of the FPGA, and the FPGA is connected to the A/D converter. The resistor R1, the resistor R2 and the resistor R3 are connected through an A/D converter, and the FPGA is bidirectionally connected to the computer.

具体地，所述各相首端穿心差分式CT均为穿心差分式电流互感器，各相末端穿心式CT均为穿心式电流互感器。Specifically, the feedthrough differential CTs at the head end of each phase are feedthrough differential current transformers, and the feedthrough CTs at the ends of each phase are feedthrough current transformers.

具体地，所述FPGA与电阻RA、电阻RB及电阻RC均通过A/D转换器连接。Specifically, the FPGA is connected to the resistor RA, the resistor RB and the resistor RC through an A/D converter.

具体地，所述FPGA与A相电压控制电流源、B相电压控制电流源及C相电压控制电流源均通过D/A转换器连接。Specifically, the FPGA is connected to the A-phase voltage-controlled current source, the B-phase voltage-controlled current source, and the C-phase voltage-controlled current source through a D/A converter.

具体地，本实施方式三相采用首端穿心差分式电流互感器从超高压XLPE电缆线芯处获取XLPE电力电缆绝缘的三相泄露电流，以三相泄露电流与参考相泄露电流向量对比作为评价参数，实现XLPE电力电缆绝缘状态的评价，有效的解决了电缆交叉互联和负载电流不对称的影响。Specifically, in this embodiment, the three-phase leakage current of the XLPE power cable insulation is obtained from the core of the ultra-high voltage XLPE cable using the head-end through-core differential current transformer, and the three-phase leakage current and the reference phase leakage current vector are compared as the Evaluation parameters, realize the evaluation of the insulation state of XLPE power cables, and effectively solve the influence of cable cross-connection and load current asymmetry.

本实施方式通过三相超高压XLPE电力电缆、末端穿心式电流互感器、首端穿心差分式CT、电压控制电流源、FPGA和计算机等的连接，实现XLPE电缆绝缘三相泄露电流的测量；This embodiment realizes the measurement of the three-phase leakage current of the XLPE cable insulation through the connection of the three-phase ultra-high voltage XLPE power cable, the end feedthrough current transformer, the head end feedthrough differential CT, the voltage control current source, the FPGA and the computer, etc. ;

本实施方式通过每相末端穿心式CT的输出端接有一个小电流高精密电阻，输出端经A/D转换器连接到FPGA，实现负载电流的测量；In this embodiment, the output terminal of the feedthrough CT at the end of each phase is connected with a small current high-precision resistor, and the output terminal is connected to the FPGA through the A/D converter to realize the measurement of the load current;

本实施方式通过FPGA经D/A转换器连接到电压控制电流源，该电压控制电流源连接到首端穿心差分式CT的电流补偿绕组，实现电缆首末端电流差分运算得到电缆绝缘本体泄露电流；In this embodiment, the FPGA is connected to the voltage-controlled current source through the D/A converter, and the voltage-controlled current source is connected to the current compensation winding of the head-end through-center differential CT, so as to realize the current differential operation at the head-end and the end of the cable to obtain the leakage current of the cable insulation body ;

本实施方式通过XLPE电缆每一相都装有一个首端穿心差分式CT，该首端穿心差分式CT的输出端接有一精密电阻，电缆三相首端穿心差分式电流互感器的输出端串接，并通过A/D转换器连接到FPGA，实现三相泄露电流的测量，解决了超高压XLPE电缆绝缘在线监测技术中泄露电流提取面临的难题。In this embodiment, each phase of the XLPE cable is equipped with a head-through differential CT, and the output end of the head-through differential CT is connected with a precision resistor. The output terminal is connected in series and connected to the FPGA through the A/D converter to realize the measurement of three-phase leakage current, which solves the problem of leakage current extraction in the ultra-high voltage XLPE cable insulation online monitoring technology.

具体实施方式二Specific embodiment two

一种基于具体实施方式一所述一种基于向量法的超高压XLPE电缆绝缘在线监测装置实现的监测方法，包括以下步骤：A monitoring method based on the implementation of the vector method-based ultra-high voltage XLPE cable insulation online monitoring device described in the specific embodiment 1, comprising the following steps:

步骤a、三相电源接通电源，电能分别通过各相的XLPE电缆传输到各相负载；Step a, the three-phase power supply is connected to the power supply, and the electric energy is transmitted to the load of each phase through the XLPE cable of each phase;

步骤b、通过C相首端穿心差分式CT的测量绕组检测C相XLPE电缆线芯处的参考相泄露电流信息，经过电阻R3将参考相泄露电流信息转换为参考相泄露电压信息，通过A/D转换器将参考相泄露电压信息转换为数字参考相泄露电压信息传输到FPGA中，通过计算机显示，用于实现参考相泄露电流的测量；Step b. Detect the reference phase leakage current information at the core of the C-phase XLPE cable through the measuring winding of the C-phase head end through-center differential CT, convert the reference phase leakage current information into the reference phase leakage voltage information through the resistor R3, and pass A The /D converter converts the reference phase leakage voltage information into digital reference phase leakage voltage information and transmits it to the FPGA, and displays it through the computer to realize the measurement of the reference phase leakage current;

步骤c、通过各相首端穿心差分式CT的测量绕组检测三相XLPE电缆线芯处的三相泄露电流信息，经过电阻R1、电阻R2和电阻R3将三相泄露电流信息转换为三相泄露电压信息，通过A/D转换器将三相泄露电压信息转换为数字三相泄露电压信息传输到FPGA中，通过计算机显示，以三相泄露电流信息与参考相泄露电流信息对比作为评价参数，实现XLPE电力电缆绝缘状态的评价，能够判断出具体那一相XLPE电缆出现故障和故障相的绝缘状态；Step c. Detect the three-phase leakage current information at the core of the three-phase XLPE cable through the measuring winding of the through-center differential CT at the head end of each phase, and convert the three-phase leakage current information into three-phase through the resistance R1, the resistance R2 and the resistance R3. Leakage voltage information, convert the three-phase leakage voltage information into digital three-phase leakage voltage information through the A/D converter and transmit it to the FPGA, display it through the computer, and compare the three-phase leakage current information with the reference phase leakage current information as the evaluation parameter, Realize the evaluation of the insulation state of XLPE power cables, and can determine the specific phase of the XLPE cable that is faulty and the insulation state of the faulty phase;

步骤d、通过各相的末端穿心式CT的测量绕组检测负载电流信息，通过每相末端穿心式CT的测量绕组输出端的电阻将负载电流信息转换为负载电压信号，并将所述负载电压信号传输到FPGA中，通过计算机进行显示，用于实现负载电流的测量；In step d, the load current information is detected through the measurement winding of the feedthrough CT at the end of each phase, and the load current information is converted into a load voltage signal through the resistance of the output end of the measurement winding of the feedthrough CT at the end of each phase, and the load voltage is converted into the load voltage signal. The signal is transmitted to the FPGA and displayed by the computer to measure the load current;

步骤e，FPGA根据将实时接收的所述负载电压信号传输到各相的电压控制电源中，各相的电压控制电源将电压信号转换为电流信号，传输到各相首端穿心差分式CT的电流补偿绕组中，经过各相首端穿心差分式CT的电流补偿绕组磁路补偿消除负载电流信号，通过各相首端穿心差分式CT的测量绕组测量到各相XLPE电缆绝缘本体的实际各相泄露电流信息，经过电阻R1、电阻R2和电阻R3将实际三相泄露电流信息转换为实际三相泄露电压信号，经过A/D转换器将实际三相泄露电压信息转换为数字实际三相泄露电压信号，将所述数字实际三相泄露电压信号传输到FPGA中，通过计算机进行显示，用于实现实际三相泄露电流的测量。In step e, the FPGA transmits the load voltage signal received in real time to the voltage control power supply of each phase, and the voltage control power supply of each phase converts the voltage signal into a current signal, and transmits it to the head end of each phase through the center of the differential CT. In the current compensation winding, the load current signal is eliminated by the magnetic circuit compensation of the current compensation winding of the through-center differential CT at the head end of each phase. For each phase leakage current information, the actual three-phase leakage current information is converted into the actual three-phase leakage voltage signal through the resistance R1, the resistance R2 and the resistance R3, and the actual three-phase leakage voltage information is converted into the digital actual three-phase leakage voltage information through the A/D converter. Leakage voltage signal, the digital actual three-phase leakage voltage signal is transmitted to the FPGA, and displayed by the computer, so as to realize the measurement of the actual three-phase leakage current.

具体地，步骤d中所述各相末端穿心式CT的测量绕组输出端连接的电阻将负载电流信息转换为电压信号后，均通过A/D转换器将模拟电压信号转换为数字电压信号再传输给FPGA。Specifically, in step d, after the load current information is converted into a voltage signal by the resistance connected to the output end of the measurement winding of the feedthrough CT at each phase end, the analog voltage signal is converted into a digital voltage signal through the A/D converter, and then transmitted to the FPGA.

具体地，步骤e中所述FPGA将实时接收到的负载电压信号通过D/A转换器，将数字负载电压信号转换成模拟负载电压信号再传输到各相电压控制电流源中。Specifically, in step e, the FPGA converts the load voltage signal received in real time through the D/A converter, converts the digital load voltage signal into an analog load voltage signal, and transmits it to each phase voltage control current source.

具体地，如图1所示，

Figure BDA0002271466270000061
为流过A、B、C相XLPE电缆导体的电流；
Figure BDA0002271466270000063
为流过A、B、C相负载的电流；
Figure BDA0002271466270000064
为流过A、B、C相XLPE电缆绝缘的泄露电流；
Figure BDA0002271466270000065
为参考相泄露电流；为三相泄露电流，其中
Figure BDA0002271466270000079
为A、B、C相电压控制电流源输出的电流，用于补偿流过A、B、C相负载的电流；
Figure BDA0002271466270000071
为A、B、C相末端穿心式CT输出的电压；
Figure BDA0002271466270000072
为A、B、C相首端穿心差分式CT输出的电压；NA补、NB补、NC补为A、B、C相首端穿心差分式CT补偿绕组的匝数；RA、RB、RC为A、B、C相末端穿心式CT测量绕组连接的电阻，用于将负载电流转换为电压；R1、R2、R3为A、B、C相首端穿心差分式CT测量绕组连接的电阻，用于将泄露电流转换为电压，则有：Specifically, as shown in Figure 1,
Figure BDA0002271466270000061
is the current flowing through the conductors of A, B, and C-phase XLPE cables;
Figure BDA0002271466270000063
is the current flowing through the A, B, and C phase loads;
Figure BDA0002271466270000064
is the leakage current flowing through the insulation of the A, B, and C phase XLPE cables;
Figure BDA0002271466270000065
is the reference phase leakage current; is the three-phase leakage current, where
Figure BDA0002271466270000079
It is the current output by the A, B, and C phase voltage control current source, which is used to compensate the current flowing through the A, B, and C phase loads;
Figure BDA0002271466270000071
is the voltage output by the feedthrough CT at the end of phase A, B, and C;
Figure BDA0002271466270000072
is the output voltage of the through-center differential CT at the first end of the A , B , and C phases; , RB, RC are the resistances connected to the measuring windings of the through-core CT at the ends of the A, B, and C phases, which are used to convert the load current into voltage; R1, R2, and R3 are the first-end through-center differential CTs of the A, B, and C phases. Measure the resistance of the winding connection, which is used to convert the leakage current to voltage, there is:

Figure BDA0002271466270000073
Figure BDA0002271466270000073

式中：

Figure BDA0002271466270000074
为流过A、B、C相XLPE电缆的电流，单位为A；
Figure BDA0002271466270000075
为流过A、B、C相负载的电流，单位为A；
Figure BDA0002271466270000076
为流过A、B、C相XLPE电缆绝缘的泄露电流，单位为A；由于首端穿心差分式CT中磁势＝电流·匝数，则：where:
Figure BDA0002271466270000074
is the current flowing through the A, B, and C phase XLPE cables, and the unit is A;
Figure BDA0002271466270000075
is the current flowing through A, B, and C-phase loads, and the unit is A;
Figure BDA0002271466270000076
is the leakage current flowing through the insulation of A, B, and C-phase XLPE cables, the unit is A; since the magnetic potential in the head-end through-core differential CT = current · number of turns, then:

Figure BDA0002271466270000077
Figure BDA0002271466270000077

Figure BDA0002271466270000078
Figure BDA0002271466270000078

式中：KA末、KB末、KC末为末端A、B、C相穿心式CT转换系数，单位为A·匝/V；NA补、NB补、NC补为A、B、C相首端穿心差分式CT补偿绕组的匝数，单位为匝；

Figure BDA00022714662700000813
为电压控制电流源输出的电流，单位为A；由式(2)和式(3)得：In the formula: K A end , K B end , K C end are the end A, B, C phase feedthrough CT conversion coefficients, the unit is A·turn/V; N A complement , N B complement , and N C complement are A , The number of turns of the through-center differential CT compensation winding at the head end of phase B and C, the unit is turns;
Figure BDA00022714662700000813
is the current output by the voltage-controlled current source, in A; from formula (2) and formula (3):

Figure BDA0002271466270000081
Figure BDA0002271466270000081

Figure BDA0002271466270000082
Figure BDA0002271466270000082

Figure BDA0002271466270000083
Figure BDA0002271466270000083

式中：K为首端穿心差分式CT转换系数，单位为A·匝/V；

Figure BDA0002271466270000084
为A、B、C相首端穿心差分式CT输出的电压，单位为V；
Figure BDA00022714662700000815
为三相泄露电流，单位为A。In the formula: K is the conversion coefficient of the head-end through-center differential CT, and the unit is A·turn/V;
Figure BDA0002271466270000084
is the voltage output by the through-center differential CT at the head end of phase A, B, and C, the unit is V;
Figure BDA00022714662700000815
For the three-phase leakage current, the unit is A.

具体地，如图2所示，

Figure BDA0002271466270000085
为流过A、B、C相XLPE电缆绝缘的泄露电流；
Figure BDA0002271466270000086
为当A、B、C相电缆绝缘完好时
Figure BDA0002271466270000087
和
Figure BDA0002271466270000088
的向量和，
Figure BDA0002271466270000089
与
Figure BDA00022714662700000810
相差180°；
Figure BDA00022714662700000811
分别为C、A、B相电缆绝缘不同故障时的三相泄露电流。XLPE电缆绝缘故障的判断依据为：当XLPE电缆某一相电缆绝缘故障时，该相的泄露电流将比其余完好相电缆绝缘的泄露电流大，此时电缆绝缘的三相泄露电流不为零，三相绝缘泄露电流
Figure BDA00022714662700000812
将于故障相泄露电流同相位，通过对比三相泄露电流与参考相的泄露电流相位关系可判断出具体哪一相电缆出现故障，依据三相泄露电流与参考相的泄露电流幅值关系能够判断出故障相的绝缘状态。Specifically, as shown in Figure 2,
Figure BDA0002271466270000085
is the leakage current flowing through the insulation of the A, B, and C phase XLPE cables;
Figure BDA0002271466270000086
For when the A, B, C phase cables are well insulated
Figure BDA0002271466270000087
and
Figure BDA0002271466270000088
the vector sum of ,
Figure BDA0002271466270000089
and
Figure BDA00022714662700000810
A difference of 180°;
Figure BDA00022714662700000811
They are the three-phase leakage currents of C, A, and B-phase cables with different insulation faults. The judgment basis of XLPE cable insulation fault is: when a certain phase of XLPE cable has insulation fault, the leakage current of this phase will be larger than the leakage current of other intact phase cable insulation, and the three-phase leakage current of cable insulation is not zero at this time. Three-phase insulation leakage current
Figure BDA00022714662700000812
The leakage current of the faulty phase is in the same phase, and by comparing the phase relationship between the leakage current of the three-phase leakage current and the reference phase, it can be determined which phase cable is faulty. Insulation state of the faulty phase.

本实施方式利用参考相绝缘的泄露电流作为基准，以三相泄露电流和参考相泄露电流向量对比作为评价参数，实现故障相电缆绝缘状态的评价。In this embodiment, the leakage current of the reference phase insulation is used as a reference, and the vector comparison between the three-phase leakage current and the reference phase leakage current is used as an evaluation parameter to realize the evaluation of the insulation state of the faulty phase cable.

Claims (6)

1.一种基于向量法的超高压XLPE电缆绝缘在线监测装置，其特征在于，包括三相电源、A相XLPE电缆、A相首端穿心差分式CT、A相末端穿心式CT、A相负载、B相XLPE电缆、B相首端穿心差分式CT、B相末端穿心式CT、B相负载、C相XLPE电缆、C相首端穿心差分式CT、C相末端穿心式CT、C相负载、FPGA和计算机；所述三相电源的输出端分别通过各相XLPE电缆与各相负载的输入端连接，各相负载与地GND连接，所述在每相XLPE电缆的首端和末端均连接有对应的首端穿心差分式CT和末端穿心式CT；1. an ultra-high voltage XLPE cable insulation online monitoring device based on vector method, is characterized in that, comprises three-phase power supply, A-phase XLPE cable, A-phase head end through-center differential CT, A-phase end through-center CT, A-phase Phase load, B-phase XLPE cable, B-phase head-through differential CT, B-phase end feed-through CT, B-phase load, C-phase XLPE cable, C-phase head-through differential CT, C-phase end feed-through type CT, C-phase load, FPGA and computer; the output end of the three-phase power supply is connected to the input end of each phase load through each phase XLPE cable, and each phase load is connected to the ground GND, and the output end of each phase XLPE cable is connected to the ground GND. The head end and the end are connected with corresponding head-end through-heart differential CT and end through-heart CT; 所述A相末端穿心式CT的测量绕组输出端通过电阻RA与FPGA的输入端连接，所述FPGA的输出端通过A相电压控制电流源与A相首端穿心差分式CT的电流补偿绕组输入端连接，所述A相首端穿心差分式CT的测量绕组输出端与电阻R1连接；The measurement winding output end of the feedthrough CT at the end of the A phase is connected to the input end of the FPGA through the resistor RA, and the output end of the FPGA controls the current source and the current compensation of the feedthrough differential CT at the head end of the A phase through the phase A voltage. The winding input end is connected, and the measurement winding output end of the A-phase head-end through-center differential CT is connected with the resistor R1; 所述B相末端穿心式CT的测量绕组输出端通过电阻RB与FPGA的输入端连接，所述FPGA的输出端通过B相电压控制电流源与B相首端穿心差分式CT的电流补偿绕组输入端连接，所述B相首端穿心差分式CT的测量绕组输出端与电阻R2连接；The measurement winding output end of the feedthrough CT at the end of the B phase is connected to the input end of the FPGA through the resistor RB, and the output end of the FPGA controls the current source and the current compensation of the feedthrough differential CT at the head end of the B phase through the B phase voltage. The winding input end is connected, and the measurement winding output end of the B-phase head-end through-center differential CT is connected with the resistor R2; 所述C相末端穿心式CT的测量绕组输出端通过电阻RC与FPGA的输入端连接，所述FPGA的输出端通过C相电压控制电流源与C相首端穿心差分式CT的电流补偿绕组输入端连接，所述C相首端穿心差分式CT的测量绕组输出端与电阻R3连接；所述电阻R1通过一条电线串联电阻R2和电阻R3后连接到A/D转换器，电阻R1与A/D转换器连接，所述A/D转换器与FPGA的输入端连接，所述FPGA与电阻R3通过A/D转换器连接，所述FPGA与计算机双向连接。The measuring winding output end of the C-phase end feedthrough CT is connected to the input end of the FPGA through the resistor RC, and the output end of the FPGA controls the current source and the C-phase head end feedthrough differential CT current compensation through the C-phase voltage. The winding input end is connected, and the measurement winding output end of the C-phase head-end through-center differential CT is connected to the resistor R3; the resistor R1 is connected to the A/D converter through a wire in series with the resistor R2 and the resistor R3, and the resistor R1 It is connected with the A/D converter, the A/D converter is connected with the input end of the FPGA, the FPGA is connected with the resistor R3 through the A/D converter, and the FPGA is connected with the computer bidirectionally. 2.根据权利要求1所述一种基于向量法的超高压XLPE电缆绝缘在线监测装置，其特征在于，所述FPGA与电阻RA、电阻RB及电阻RC均通过A/D转换器连接。2. A kind of ultra-high voltage XLPE cable insulation online monitoring device based on the vector method according to claim 1, is characterized in that, described FPGA and resistance RA, resistance RB and resistance RC are all connected through A/D converter. 3.根据权利要求1所述一种基于向量法的超高压XLPE电缆绝缘在线监测装置，其特征在于，所述FPGA与A相电压控制电流源、B相电压控制电流源及C相电压控制电流源均通过D/A转换器连接。3. a kind of ultra-high voltage XLPE cable insulation online monitoring device based on vector method according to claim 1, is characterized in that, described FPGA and A phase voltage control current source, B phase voltage control current source and C phase voltage control current The sources are all connected via D/A converters. 4.一种基于权利要求1所述一种基于向量法的超高压XLPE电缆绝缘在线监测装置实现的监测方法，其特征在于，包括以下步骤：4. a kind of monitoring method based on the described a kind of vector method-based ultra-high voltage XLPE cable insulation online monitoring device realization of claim 1, is characterized in that, comprises the following steps: 步骤a、三相电源接通电源，电能分别通过各相的XLPE电缆传输到各相负载；Step a, the three-phase power supply is connected to the power supply, and the electric energy is transmitted to the load of each phase through the XLPE cable of each phase; 步骤b、通过C相首端穿心差分式CT的测量绕组检测C相XLPE电缆线芯处的参考相泄露电流信息，经过电阻R3将参考相泄露电流信息转换为参考相泄露电压信息，通过A/D转换器将参考相泄露电压信息转换为数字参考相泄露电压信息传输到FPGA中，通过计算机显示，用于实现参考相泄露电流的测量；Step b. Detect the reference phase leakage current information at the core of the C-phase XLPE cable through the measuring winding of the C-phase head end through-center differential CT, convert the reference phase leakage current information into the reference phase leakage voltage information through the resistor R3, and pass A The /D converter converts the reference phase leakage voltage information into digital reference phase leakage voltage information and transmits it to the FPGA, and displays it through the computer to realize the measurement of the reference phase leakage current; 步骤c、通过各相首端穿心差分式CT的测量绕组检测三相XLPE电缆线芯处的三相泄露电流信息，经过电阻R1、电阻R2和电阻R3将三相泄露电流信息转换为三相泄露电压信息，通过A/D转换器将三相泄露电压信息转换为数字三相泄露电压信息传输到FPGA中，通过计算机显示，以三相泄露电流信息与参考相泄露电流信息对比作为评价参数，实现XLPE电力电缆绝缘状态的评价，能够判断出具体那一相XLPE电缆出现故障和故障相的绝缘状态；Step c. Detect the three-phase leakage current information at the core of the three-phase XLPE cable through the measuring winding of the through-center differential CT at the head end of each phase, and convert the three-phase leakage current information into three-phase through the resistance R1, the resistance R2 and the resistance R3. Leakage voltage information, convert the three-phase leakage voltage information into digital three-phase leakage voltage information through the A/D converter and transmit it to the FPGA, display it through the computer, and compare the three-phase leakage current information with the reference phase leakage current information as the evaluation parameter, Realize the evaluation of the insulation state of XLPE power cables, and can determine the specific phase of the XLPE cable that is faulty and the insulation state of the faulty phase; 步骤d、通过各相的末端穿心式CT的测量绕组检测负载电流信息，通过每相末端穿心式CT的测量绕组输出端的电阻将负载电流信息转换为负载电压信号，并将所述负载电压信号传输到FPGA中，通过计算机进行显示，用于实现负载电流的测量；In step d, the load current information is detected through the measurement winding of the feedthrough CT at the end of each phase, and the load current information is converted into a load voltage signal through the resistance of the output end of the measurement winding of the feedthrough CT at the end of each phase, and the load voltage is converted into the load voltage signal. The signal is transmitted to the FPGA and displayed by the computer to measure the load current; 步骤e、FPGA根据将实时接收的所述负载电压信号传输到各相的电压控制电源中，各相的电压控制电源将电压信号转换为电流信号，传输到各相首端穿心差分式CT的电流补偿绕组中，经过各相首端穿心差分式CT的电流补偿绕组磁路补偿消除负载电流信号，通过各相首端穿心差分式CT的测量绕组测量到各相XLPE电缆绝缘本体的实际泄露电流信息，经过电阻R1、电阻R2和电阻R3将实际三相泄露电流信息转换为实际三相泄露电压信号，经过A/D转换器将实际三相泄露电压信息转换为数字实际三相泄露电压信号，将所述数字实际三相泄露电压信号传输到FPGA中，通过计算机进行显示，用于实现实际三相泄露电流的测量。In step e, the FPGA transmits the load voltage signal received in real time to the voltage control power supply of each phase, and the voltage control power supply of each phase converts the voltage signal into a current signal, and transmits it to the head end of each phase through the center differential CT. In the current compensation winding, the load current signal is eliminated by the magnetic circuit compensation of the current compensation winding of the through-center differential CT at the head end of each phase. Leakage current information, the actual three-phase leakage current information is converted into the actual three-phase leakage voltage signal through the resistor R1, the resistor R2 and the resistor R3, and the actual three-phase leakage voltage information is converted into the digital actual three-phase leakage voltage through the A/D converter The digital actual three-phase leakage voltage signal is transmitted to the FPGA, and displayed by the computer, so as to realize the measurement of the actual three-phase leakage current. 5.根据权利要求4所述一种基于向量法的超高压XLPE电缆绝缘在线监测方法，其特征在于，步骤d中所述各相末端穿心式CT的测量绕组输出端连接的电阻将负载电流信息转换为电压信号后，均通过A/D转换器将模拟电压信号转换为数字电压信号再传输给FPGA。5. a kind of ultra-high voltage XLPE cable insulation online monitoring method based on vector method according to claim 4, is characterized in that, the resistance that the measuring winding output end of each phase end feedthrough CT described in step d is connected will load current. After the information is converted into a voltage signal, the analog voltage signal is converted into a digital voltage signal through the A/D converter and then transmitted to the FPGA. 6.根据权利要求4所述一种基于向量法的超高压XLPE电缆绝缘在线监测方法，其特征在于，步骤e中所述FPGA将实时接收到的负载电压信号通过D/A转换器，将数字负载电压信号转换成模拟负载电压信号再传输到各相电压控制电流源中。6. a kind of ultra-high voltage XLPE cable insulation on-line monitoring method based on vector method according to claim 4, is characterized in that, described in step e, the load voltage signal that FPGA receives in real time passes through D/A converter, and digital The load voltage signal is converted into an analog load voltage signal and then transmitted to each phase voltage control current source.
CN201911106471.XA 2019-11-13 2019-11-13 Ultrahigh voltage XLPE cable insulation on-line monitoring device and monitoring method based on vector method Active CN110716111B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911106471.XA CN110716111B (en) 2019-11-13 2019-11-13 Ultrahigh voltage XLPE cable insulation on-line monitoring device and monitoring method based on vector method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911106471.XA CN110716111B (en) 2019-11-13 2019-11-13 Ultrahigh voltage XLPE cable insulation on-line monitoring device and monitoring method based on vector method

Publications (2)

Publication Number Publication Date
CN110716111A true CN110716111A (en) 2020-01-21
CN110716111B CN110716111B (en) 2024-07-02

Family

ID=69214988

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911106471.XA Active CN110716111B (en) 2019-11-13 2019-11-13 Ultrahigh voltage XLPE cable insulation on-line monitoring device and monitoring method based on vector method

Country Status (1)

Country Link
CN (1) CN110716111B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113092944A (en) * 2021-04-12 2021-07-09 广东电网有限责任公司江门供电局 Insulation fault point detection method and related device for low-voltage line
CN113376553A (en) * 2021-04-27 2021-09-10 国网江苏省电力有限公司营销服务中心 Intelligent discrimination method and system for three-phase four-wire metering string current loop wiring

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101359028A (en) * 2008-08-21 2009-02-04 深圳市奇辉电气有限公司 Measurement method for cable insulation leakage current
CN102879716A (en) * 2012-09-24 2013-01-16 哈尔滨理工大学 On-line monitoring method and device for main insulation of three-phase cables under metal sheath cross-connection
CN203299337U (en) * 2013-06-24 2013-11-20 长沙理工大学 High voltage XLPE cable insulation on-line monitoring device
CN103941161A (en) * 2014-05-12 2014-07-23 国家电网公司 An online monitoring system for cable sheath current and ampacity
CN104597326A (en) * 2014-12-25 2015-05-06 杭州墨锐机电科技有限公司 Real-time monitoring system for insulation of underground large-power device
CN205120809U (en) * 2015-11-20 2016-03-30 国家电网公司 Insulating leakage current's of single core cable measurement structure under service condition
CN105676092A (en) * 2016-03-29 2016-06-15 中国石油大学(北京) Method and system for monitoring insulation level of substation power cable
CN105785246A (en) * 2016-04-25 2016-07-20 国网江苏省电力公司电力科学研究院 Live-line detecting and on-line monitoring device used for ultrahigh-voltage power cable insulation diagnosis
CN106771869A (en) * 2016-12-21 2017-05-31 哈尔滨理工大学 Long range power cable insulation on-line monitoring method based on current in resistance property partition method
CN108037423A (en) * 2017-12-08 2018-05-15 哈尔滨理工大学 A kind of high-voltage cable insulating on-Line Monitor Device and method based on double differential CT methods
CN110161391A (en) * 2019-05-07 2019-08-23 四川大学 The method monitored on-line to cable insulation is inversely injected by low frequency signal
CN211014528U (en) * 2019-11-13 2020-07-14 南方电网科学研究院有限责任公司电网技术研究中心 An online monitoring device for ultra-high voltage XLPE cable insulation based on vector method

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101359028A (en) * 2008-08-21 2009-02-04 深圳市奇辉电气有限公司 Measurement method for cable insulation leakage current
CN102879716A (en) * 2012-09-24 2013-01-16 哈尔滨理工大学 On-line monitoring method and device for main insulation of three-phase cables under metal sheath cross-connection
CN203299337U (en) * 2013-06-24 2013-11-20 长沙理工大学 High voltage XLPE cable insulation on-line monitoring device
CN103941161A (en) * 2014-05-12 2014-07-23 国家电网公司 An online monitoring system for cable sheath current and ampacity
CN104597326A (en) * 2014-12-25 2015-05-06 杭州墨锐机电科技有限公司 Real-time monitoring system for insulation of underground large-power device
CN205120809U (en) * 2015-11-20 2016-03-30 国家电网公司 Insulating leakage current's of single core cable measurement structure under service condition
CN105676092A (en) * 2016-03-29 2016-06-15 中国石油大学(北京) Method and system for monitoring insulation level of substation power cable
CN105785246A (en) * 2016-04-25 2016-07-20 国网江苏省电力公司电力科学研究院 Live-line detecting and on-line monitoring device used for ultrahigh-voltage power cable insulation diagnosis
CN106771869A (en) * 2016-12-21 2017-05-31 哈尔滨理工大学 Long range power cable insulation on-line monitoring method based on current in resistance property partition method
CN108037423A (en) * 2017-12-08 2018-05-15 哈尔滨理工大学 A kind of high-voltage cable insulating on-Line Monitor Device and method based on double differential CT methods
CN110161391A (en) * 2019-05-07 2019-08-23 四川大学 The method monitored on-line to cable insulation is inversely injected by low frequency signal
CN211014528U (en) * 2019-11-13 2020-07-14 南方电网科学研究院有限责任公司电网技术研究中心 An online monitoring device for ultra-high voltage XLPE cable insulation based on vector method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113092944A (en) * 2021-04-12 2021-07-09 广东电网有限责任公司江门供电局 Insulation fault point detection method and related device for low-voltage line
CN113376553A (en) * 2021-04-27 2021-09-10 国网江苏省电力有限公司营销服务中心 Intelligent discrimination method and system for three-phase four-wire metering string current loop wiring

Also Published As

Publication number Publication date
CN110716111B (en) 2024-07-02

Similar Documents

Publication Publication Date Title
CN107102236B (en) A single-phase-to-ground fault line selection method based on post-fault waveform correlation analysis
CN102879716A (en) On-line monitoring method and device for main insulation of three-phase cables under metal sheath cross-connection
WO2010081280A1 (en) Three-phase electric energy measurement apparatus
CN102593737B (en) Relay protection vector checkout facility method before putting into operation with the transformer station of capacitance compensation
CN110333409B (en) On-line detection method of rated capacity of distribution transformer
CN103926514A (en) Insulation diagnostic method for high-voltage equipment in charged operating state
CN102944810B (en) Test device for secondary circuit zero line site of voltage transformer
CN108037423A (en) A kind of high-voltage cable insulating on-Line Monitor Device and method based on double differential CT methods
CN207181589U (en) It is a kind of to be used for the device being monitored powered to deformation of transformer winding
CN101614798B (en) Electronic Transformer Polarity Detection System
CN110716111A (en) Ultrahigh-voltage XLPE cable insulation online monitoring device and method based on vector method
CN101673941A (en) Zero sequence current differential protection method
CN115575856B (en) Online monitoring method and system for leakage current of lightning arrester in power transmission cable terminal field
CN105548821A (en) Lightning arrester live detection method
CN108318732A (en) A kind of transformer iron core grounding current on-Line Monitor Device and method
CN211014528U (en) An online monitoring device for ultra-high voltage XLPE cable insulation based on vector method
CN107797017A (en) A kind of method of power transformer live detection loss characteristics parameter
CN107271775B (en) electric power overhead line phase detection method
CN105203886A (en) Capacitive type current transformer online detection device and method
CN205067693U (en) High -voltage switch machinery and electrical characteristics detector
CN209373017U (en) A kind of rail traction substation low-voltage energization detection experimental rig
CN106771514A (en) A kind of device and method of quick lookup voltage transformer failure
CN114252673B (en) Method for detecting secondary circuit of voltage transformer of substation
CN102590645B (en) Phase testing method for alternating current high-voltage power supply circuit by using single-pole phase testing device
CN205176158U (en) Electric capacity type current transformer on -line measuring device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant